DHEA-d5 (Prasterone-d5, Dehydroisoandrosterone-d5, Dehydroepiandrosterone-d5) is the deuterium labeled DHEA (HY-14650). DHEA (Prasterone) is one of the most abundant steroid hormones. DHEA (Prasterone) mediates its action via multiple signaling pathways involving specific membrane receptors and via transformation into androgen and estrogen derivatives (e.g., androgens, estrogens, 7alpha and 7beta DHEA, and 7alpha and 7beta epiandrosterone derivatives) acting through their specific receptors.